ACRYLIC%20SHEET%20EDGE%20AND%20SURFACE%20FINISHING.docx

Clamp the work vertically start at the rear of the

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Clamp the work vertically. Start at the rear of the edge with the scraper tilted 45° and draw with uniform speed and pressure to the front. A uniform strip should be removed. Follow an edge polishing procedure for a higher finish.
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Flame Polishing Edges Flame polishing should be done with an oxygen-hydrogen welding torch. It is important to remove the protective masking from the material's edge when flame polishing. The flame should be bluish, nearly invisible, approximately 3" (75mm) long and narrow. Hold the torch even to the edge and at a slight angle. Then, draw the flame along the edge of the sheet. Practice will help you estimate the speed and distance. If the first pass does not produce a completely polished edge, allow the piece to cool, then try a second pass. Remember that when flame polishing, the sudden heating of the sheet induces a high degree of stress. After flame polishing, be sure to anneal the part. This will decrease the amount of stress and reduce or prevent the chance of crazing over time. Edge Finishing Machines Commercially available edge finishing machines offer a fast method of obtaining smooth edges without sanding or scraping. Finishes range from smooth edges with slight machining marks to smooth, almost polished edges, depending on the design of the machine and cutting tools used. Machine finished edges are ideal for cementing or flame polishing, but are sharp and require some additional fabrication to make them safe for handling. Care should be taken to adjust the feed rate to eliminate chipping and melting. Feed rates that are too fast will result in chipping, while a slow feed rate will result in melting. Edge finishing machines will vary in cutter diameter and rotation speed. In general, machines with larger cutter and higher rotation speeds will permit faster feed rates without chipping. Written by Grant LaFontaine, Sheet Products Technical Service Manager, CYRO Industries Plastic Painting Tips By James Holloway, eHow Contributor X
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Painting plastic surfaces presents its own challenges.
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